Possibly buggy cache handling when using hx-select / hx-target in htmx 2.x

I have two files "first.html"

```

First

• First


• Second

First

```

and "second.html"

```

Second

• First


• Second

Second

```

served by some (any) webserver from the same directory.

I open ```http://.../first.html``` in some browser (I tried Firefox, Chromium and MS Edge (Linux)) and perform the following steps:

| Action | URL in browser after action | content shown after action |
| ----------------------------- | ------------------------------------- | ------------------------------------ |
| | first.html | "First" |
| Click on link "Second" | second.html | "Second" |
| Browser "back" | first.html | "First" |
| Click on link "Second" | second.html | "Second" |
| Browser "back" | first.html | **"Second"** <-- _WTF?_ |

After the second time I stepped back through the browser history, URL and content have diverged!

Now if I **remove** ```hx-select="main" hx-target="main" hx-swap="outerHTML"``` and start again (SHIFT+F5 hard reload for "first.html") everything works.

Also, if I **keep** ```hx-select="main" hx-target="main" hx-swap="outerHTML"``` but **switch to HTMX 1.9.12** everything works, too.

So to me this really looks like a bug in HTMX 2.x?!

Can anyone confirm if it is a bug or show me what I'm doing wrong?

Thanks!
Heiko